Need to open up my RWS Diana P5....it's losing power.....used to be I aim at the 6 o'clock position and I'll hit the bull. Now I've to aim at the 12 o'clock position for the pellets to hit it. The rear sights have been adjusted to it's maximum height. Maybe the spring have become weak or a piston seal problem......
Pistol: RWS Diana P5 Magnum, Sights: Fiber Optics, Pellet: .177 Crosman Wad, Distance: 10 Meters,
Position: Stand/Two Hand, Temp: +8C, Sun, 10kph wind, SCORE: 132/200